Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-20
Mon.Not.Roy.Astron.Soc.371:1983-1991,2006
Astronomy and Astrophysics
Astrophysics
9 pages, 10 figures, 1 table. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10823.x
We present the discovery of three faint dwarf galaxies and a globular cluster in the halo of the Andromeda galaxy (M31), found in our MegaCam survey that spans the southern quadrant of M31, from a projected distance of ~50 kpc to \~150 kpc. Though the survey covers 57 sq. degrees, the four satellites lie within 2\deg of one another. We estimate that the globular cluster lies at a total distance of 175+/-55 kpc from M31, making it the farthest M31 globular cluster known. It also shows the typical characteristics of a bright globular cluster, with a half-light radius of 2.3+/-0.2 pc and an absolute magnitude in the V band of M_{V,0}=-8.5+/-0.3 and contains a very old population with a metallicity of [Fe/H]~-1.3. The three dwarf galaxies are all very faint, with absolute magnitudes in the range -7.3
Chapman Sandra
Ferguson Annette M. N.
Ibata Rodrigo A.
Irwin Mary Jane
Lewis Geraint F.
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